"When the river channels are accurately adjusted to the amount of rainfall in the river basin, destructive floods will be averted. We can never expect that the Mississippi will be absolutely put in harness. The basin is too huge, the amount of water that has to be carried down is too great. Permanent dredging and permanent levee construction and repair will always be necessary, and a close co-ordination between the Weather Bureau and the government and state engineers is a first need in the problem." "Just how does the Weather Bureau come in," asked Ross, "the rainfall?" "It isn't only the rainfall of the few days in advance," the Forecaster answered, "it's the rain that has fallen before and the rain that's going to fall. If there should be twelve inches of rainfall after a long drought throughout the Mississippi basin, it would make comparatively little difference, for all the rain that fell on the dry ground would be sucked up by it and only a very little would flow into the rivers and streams that feed the Mississippi. "On the other hand, if there had been slight but frequent rains for weeks and weeks, those twelve inches of water would make an entirely different story. No one, except the Weather Bureau, would have kept track of the amount of rain that had fallen. "If the ground has been steadily soaked, even by light occasional showers, twelve inches more of rain cannot soak in. Therefore, the entire amount of rain will flow directly into the stream channels and thus into the Mississippi. Flood warnings will be sent out, the height of the flood crest can be estimated, the length of the period of the danger will be known in advance and the proper preparations can be made. If further rain is threatened, that information can be sent out, also, and the entire Mississippi valley is completely prepared. That's the true preparedness, my boy, being ready for the foe that you know will come. Stupidity or cowardice are the only causes for not being willing and ready to help in time of danger." "What can a chap do?" asked Ross, aflame with eagerness. The Forecaster looked at him thoughtfully, but before he answered, Anton piped in, with a plaintive note in his voice: "Is there anything that I could do?" In spite of himself, the Forecaster's glance fell on the crutch. Anton's intent gaze followed the look and he flushed. A sudden silence fell, the silence of an abiding tragedy from which all eyes are always turned, the tragedy of the disabled. "Yes," he said with grave quietness, "there's a great deal that you can do." The crippled lad regarded him steadily. The steady rushing of the Mississippi in flood could be heard near by with its thousand miles of menace. "We need work," the weather expert said, at last, "work with the heart behind it. Even now, the United States Weather Bureau has over four thousand co-operative observers, who work without pay, who work with their hearts behind their duties. Still, this is all too few."